If you look at the 2nd pic you'll see the magnets have what looks like the head of a Phillips head bolt in the middle which is exactly what it is. These magnets (Amazon) have holes in the middle on them. Also you want to use a locking nut or Locite Thread locker. If you just screw on a nut the magnets can start to rotate over time as you remove and replace the pistol. Mechanical attachment is always the most secure which is why SgtSaint's ski boot buckle system is such a great solution for attaching the chest armor